// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_THEME_HELPER_MAC_H_
#define CONTENT_BROWSER_THEME_HELPER_MAC_H_

#include "base/macros.h"
#include "base/memory/singleton.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"

namespace content {

class ThemeHelperMac : public NotificationObserver {
public:
    // Return pointer to the singleton instance for the current process, or NULL
    // if none.
    static ThemeHelperMac* GetInstance();

    // Returns the value of +[NSScroller preferredScrollStyle] as expressed
    // as the blink enum value.
    static blink::ScrollerStyle GetPreferredScrollerStyle();

private:
    friend struct base::DefaultSingletonTraits<ThemeHelperMac>;

    ThemeHelperMac();
    ~ThemeHelperMac() override;

    // Overridden from NotificationObserver:
    void Observe(int type,
        const NotificationSource& source,
        const NotificationDetails& details) override;

    NotificationRegistrar registrar_;

    DISALLOW_COPY_AND_ASSIGN(ThemeHelperMac);
};

} // namespace content

#endif // CONTENT_BROWSER_THEME_HELPER_MAC_H_
